Experimental Physics and
Industrial Control System

[email protected] (Ralph Lange) · Fri, 11 Dec 1998 15:46:03 +0100 (MET)

> I have a naive question here.  I was under the impression that even if a
> record requested that monitors be posted on a field which had not changed,
> that channel access would not actually post the monitors if the values were
> the same.  Is this true?

Generally yes.

When a CA client opens a monitor connection, it immediately gets the current
value in the response and it is added to a list in the record.

During record processing the record checks for its value to have changed and
(if it has changed) sends out "value change events" to all the clients in
the list.

Ralph Lange

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System